Something else to consider depending on how you got to the handpropping decision. If the aircraft has a standard heavyweight starter (only type I have experience with) which has already engaged the starter ring for some reason, you'll have the devil's own job trying to hand prop with that dragging on it. It can be done but it is absolutely knackering. Ask John Tempest. Probably 20 blades it took to start my Pitts and I think he needed to have a lie down afterward!
Pitts2112